Mr sumit @ And if a baby has acid reflux, I do believe doctor's recommend tummy sleeping. But it's a BAD sleeping position even for adults. better not to practice .
Dear sonia, Try flipping her slowly from tummy to back/ sides when baby girl is sleeping (she may wake sometimes). I practiced to my son and he sleeps on sides with pillows either sides. Hope it will help.

no Mr. sumit, for babies sleeping on stomach is not good, as it causes increase risk of SIDS (sudden infant death syndrome) there are many reason for SIDS, and one of them is suffocation which can happen when baby lie on stomach, mainly this syndrome risk is at peak upto 4 month but until 1 year it's a risk , so always try to sleep on back